Quick connect air fitting Dust Cap
thingiverse
A simple dust cap for the quick connect air nipple on your accessory. Keeps the bugs out. Has a lanyard hole so you don't lose the &@#$ thing. Also printing in a bright color will help with that. Should be a snug fit. Can be printed in any material, I think. I used PLA. Worked best for me printed at 102%, your mileage may vary.
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